Here's what rhymes with sincerity.
verity parity rarity similarity clarity celerity hilarity insincerity disparity polarity posterity dexterity temerity prosperity familiarity solidarity singularity subsidiarity angularity bipolarity capillarity popularity peculiarity regularity irregularity granularity unfamiliarity Words that almost rhyme with sincerity
therapy parody fidelity melody hypnotherapy chemotherapy psychotherapy physiotherapy hydrotherapy radiotherapy heresy necessity heavily integrity seventy heredity serenity severally verily merrily sesame warily wearily velvety acerbity carefully density intensity readily penalty specially steadily deputy heavenly legacy centrally specialty terribly brevity felony incessantly indemnity leprosy immensity amenity heraldry inequity retinae apparently identity necessarily essentially chemistry destiny extremity jealousy mentally secondly chemically hegemony peasantry carelessly longevity pedigree sensibly solemnity tenancy convexity insensibly medically weaponry pedantry revelry unbearably helpfully impeccably legibly nonentity tenantry testily unsteadily devilry fretfully ineffably negligee prayerfully temperately primarily successfully tendency presently supremacy temporarily voluntarily allegedly incidentally pleasantly ascendancy helplessly incredibly ascendency clemency dentistry dreadfully jealously militarily recklessly secondarily confessedly flexibly indelibly mastectomy pleasantry telemetry telepathy credibly impetuously inclemency vasectomy complexity potentially pregnancy ordinarily arbitrarily expectancy momentarily ostensibly transparency customarily perplexity unnecessarily hysterectomy marvellously restlessly sequentially splendidly acceptably breathlessly expectantly professedly regretfully transparently unpleasantly regrettably resentfully tangentially independently dependency fundamentally accidentally discrepancy respectfully unsuccessfully biochemistry contentedly preferentially coincidentally confidentially incrementally inexpressibly lamentably biochemically existentially geochemistry indispensably instrumentally quintessentially respectably sentimentally tonsillectomy unacceptably conscientiously environmentally tremendously exponentially relentlessly clandestinely providentially incontestably experimentally extraordinarily contemptuously developmentally superintendency temperamentally